Energy is obtained from rivers by______.
A、building bridges across them
B、driving generators into them
C、building dams across them
D、directing them into homes and factories
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试题解析
54.答案为B 此题为细节题。从文章中的第四段第二句Man constructs...and get the energy needed to drive generators可以得知河水通过推动发电机运转获得电力能源。